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Damage Control: Plants Juggle Genome Maintenance and Growth by Being Organized | |
admin | |
2021 | |
发布年 | 2021 |
语种 | 英语 |
国家 | 美国 |
领域 | 气候变化 |
正文(英文) | Humans pride themselves on being able to multitask, especially under pressure. But it turns out that we aren't the only ones who are organized: researchers from Japan have discovered that plants balance genome maintenance with organ growth by organizing different responses to DNA damage. In a study published in Science Advances, a research team led by Nara Institute of Science and Technology has revealed that plants use combined control of the plant hormones cytokinin and auxin to organize DNA damage responses while maintaining growth. Plants are highly adaptable organisms that never stop growing, thanks largely to the functions carried out by their roots. Because of the essential role that roots play in plant growth, root development is highly responsive to fluctuating conditions underground, including environmental stresses. These stresses tend to limit root growth, and can damage DNA. "Plants actively respond to DNA damage, and these responses are controlled by the cell cycle checkpoint mechanism," says project leader Masaaki Umeda. "The cell cycle is stopped at a certain stage so that DNA can be repaired, or in extreme cases, cell death initiated. What we wanted to know was how the DNA damage responses are organized to allow continuous root growth." Unlike animal cells, plant cells aren't mobile, so plants can't replace dead cells with surrounding living cells. To simultaneously maintain their genomes and allow organ development, plants initiate different DNA damage responses that are dependent on the different types of cells in tissues. "We found that the combined control of two plant hormones, cytokinin and auxin, organizes different DNA damage responses at the cost of minimized cell death," explains first author Naoki Takahashi. "This is a sophisticated way to retain stem cells while maintaining their genomes in damaged plants." A decrease in auxin triggers stem cell death and stops the cell cycle at the G2 phase, while increased cytokinin signals support early endoreplication -- a cell cycle variant where the genome is duplicated without cell division. The study explains previously unidentified mechanisms of keeping genomes stable in a developmental setting, which allow continuous organ growth in fluctuating environments. The results of this study will have wide-ranging applications to research on agricultural technologies, particularly for plant growth and development in extreme environments. Future studies will illuminate how plants develop organs beyond the embryonic stage via the maintenance of genome stability in changing conditions.
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Story Source: Materials provided by Nara Institute of Science and Technology. Note: Content may be edited for style and length. Journal Reference:
Cite This Page: Nara Institute of Science and Technology. "Damage control: Plants juggle genome maintenance and growth by being organized." ScienceDaily. ScienceDaily, 16 June 2021.
Nara Institute of Science and Technology. (2021, June 16). Damage control: Plants juggle genome maintenance and growth by being organized. ScienceDaily. Retrieved June 17, 2021 from www.sciencedaily.com/releases/2021/06/210616143008.htm
Nara Institute of Science and Technology. "Damage control: Plants juggle genome maintenance and growth by being organized." ScienceDaily. www.sciencedaily.com/releases/2021/06/210616143008.htm (accessed June 17, 2021).
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URL | 查看原文 |
来源平台 | Science Daily |
文献类型 | 新闻 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/330308 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | admin. Damage Control: Plants Juggle Genome Maintenance and Growth by Being Organized. 2021. |
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